CN108359976A - A method of for reducing laser melting coating alumina base composite coating crackle - Google Patents
A method of for reducing laser melting coating alumina base composite coating crackle Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 94
- 239000011248 coating agent Substances 0.000 title claims abstract description 84
- 239000002131 composite material Substances 0.000 title claims abstract description 44
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000008018 melting Effects 0.000 title claims description 21
- 238000002844 melting Methods 0.000 title claims description 20
- 208000037656 Respiratory Sounds Diseases 0.000 title claims 11
- 238000004372 laser cladding Methods 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052786 argon Inorganic materials 0.000 claims abstract description 5
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910000883 Ti6Al4V Inorganic materials 0.000 claims description 3
- 229920002301 cellulose acetate Polymers 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 2
- 239000012300 argon atmosphere Substances 0.000 claims 1
- 239000007767 bonding agent Substances 0.000 claims 1
- 238000000227 grinding Methods 0.000 claims 1
- XLSMFKSTNGKWQX-UHFFFAOYSA-N hydroxyacetone Chemical compound CC(=O)CO XLSMFKSTNGKWQX-UHFFFAOYSA-N 0.000 claims 1
- 238000010309 melting process Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 claims 1
- 238000007781 pre-processing Methods 0.000 claims 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 1
- 239000000758 substrate Substances 0.000 abstract description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 abstract description 11
- 229910010413 TiO 2 Inorganic materials 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 239000011148 porous material Substances 0.000 description 10
- 229910001069 Ti alloy Inorganic materials 0.000 description 6
- 238000005253 cladding Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000011812 mixed powder Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 210000001787 dendrite Anatomy 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
本发明公开了一种用于减少激光熔覆氧化铝基复合涂层裂纹的方法，将激光熔覆粉体预置于基体表面，在氩气保护气氛下进行激光熔覆，得厚度为0.3‑0.6mm的氧化铝基复合涂层；包括：基体预处理、配置激光熔覆粉体、预置粉末和激光熔覆工序；激光熔覆粉体按质量百分比计为：Al2O356‑72％，TiO214‑18％，WC10‑30％，其中Al2O3颗粒度为20‑50μm，激光熔覆功率为1000‑2000W；本发明通过加入适量WC，得到的氧化铝基复合涂层组织致密、均匀且无裂纹，与金属基材形成良好的冶金结合；且过程易于实现自动化控制，效率高、无污染且成本低，具有较为理想的工程应用价值。
The invention discloses a method for reducing cracks in laser cladding aluminum oxide-based composite coatings. Laser cladding powder is pre-placed on the surface of a substrate, and laser cladding is carried out under an argon protective atmosphere to obtain a thickness of 0.3- 0.6mm alumina-based composite coating; including: substrate pretreatment, laser cladding powder configuration, pre-powder and laser cladding process; laser cladding powder is calculated by mass percentage: Al 2 O 3 56‑72 %, TiO 2 14‑18%, WC10‑30%, wherein the particle size of Al 2 O 3 is 20‑50 μm, and the laser cladding power is 1000‑2000W; the present invention obtains an alumina-based composite coating by adding an appropriate amount of WC The structure is dense, uniform and free of cracks, forming a good metallurgical bond with the metal substrate; and the process is easy to realize automatic control, high efficiency, no pollution and low cost, and has ideal engineering application value.
Description
技术领域technical field
本发明属于激光熔覆技术领域，涉及一种用于减少激光熔覆氧化铝基复合涂层裂纹的方法。The invention belongs to the technical field of laser cladding, and relates to a method for reducing cracks in laser cladding alumina-based composite coatings.
背景技术Background technique
激光熔覆技术因其处理时间短、灵活性和操作精度高广泛应用于金属和合金的表面改性，以及复杂零件的直接制造和修复。但是，激光束的局部加热虽可以较好的保持基材性质，但在激光熔覆成形过程中容易产生许多缺陷如裂纹、气孔和粗大柱状晶粒等，且由于激光熔覆是一个急热急冷的过程，冷却速度过快将导致涂层产生较大残余应力，在加工过程中这些残余应力和缺陷严重影响成形件的力学性能，甚至导致成形件的宏观开裂。Laser cladding technology is widely used in the surface modification of metals and alloys, as well as the direct fabrication and repair of complex parts due to its short processing time, flexibility and high operational precision. However, although the local heating of the laser beam can better maintain the properties of the substrate, it is easy to produce many defects such as cracks, pores and coarse columnar grains during the laser cladding forming process. In the process of cooling, too fast cooling rate will lead to large residual stress in the coating. During the processing, these residual stress and defects seriously affect the mechanical properties of the formed part, and even lead to macroscopic cracking of the formed part.
现有技术中，公开号106048599A的中国专利公开了激光熔覆成型金属零件的裂纹控制方法，通过引入超声振动改善熔覆成形组织、减少和消除裂纹的工艺，其熔覆层材料为镍基合金粉末Ni60，基体材料为45钢，采用3KW横流CO2激光器进行激光熔覆，成型过程中引入超声振动装置，振动频率为25KHz；该方法制备的镍基复合涂层无明显裂纹，但需要对熔池温度进行闭环控制和引入超声振动，熔覆过程中受外界因素影响较大。公开号105506615A的中国专利公开了一种通过改变激光的入射角度控制激光熔覆涂层微观组织及热裂纹敏感性的方法。激光熔覆过程中，旋转激光头，改变激光入射角度使熔池形貌和温度场发生改变，导致熔覆涂层的微观组织、生长取向和抗裂纹开裂阻力发生改变，该方法操作简单，但对激光入射角度的精度要求较高。In the prior art, Chinese Patent Publication No. 106048599A discloses a method for controlling cracks in metal parts formed by laser cladding. By introducing ultrasonic vibration to improve cladding forming structure, reduce and eliminate cracks, the cladding layer material is nickel-based alloy. Powdered Ni60, the base material is 45 steel, and a 3KW cross-flow CO2 laser is used for laser cladding. During the forming process, an ultrasonic vibration device is introduced, and the vibration frequency is 25KHz; the nickel-based composite coating prepared by this method has no obvious cracks, but the melting The pool temperature is closed-loop controlled and ultrasonic vibration is introduced, and the cladding process is greatly affected by external factors. Chinese Patent Publication No. 105506615A discloses a method of controlling the microstructure and thermal crack sensitivity of laser cladding coatings by changing the incident angle of the laser. During the laser cladding process, rotating the laser head and changing the incident angle of the laser will change the morphology and temperature field of the molten pool, resulting in changes in the microstructure, growth orientation and crack resistance of the cladding coating. This method is simple to operate, but The accuracy of the laser incident angle is required to be high.
发明内容Contents of the invention
本发明目的在于针对上述现有技术的不足，提供一种用于减少激光熔覆氧化铝基复合涂层裂纹的方法。The purpose of the present invention is to provide a method for reducing cracks in laser cladding aluminum oxide-based composite coatings in view of the above-mentioned deficiencies in the prior art.
为实现上述技术目的，本发明采用如下技术方案：In order to realize the above-mentioned technical purpose, the present invention adopts following technical scheme:
一种用于减少激光熔覆氧化铝基复合涂层裂纹的方法，将激光熔覆粉体预置于基体表面，在氩气保护气氛下进行激光熔覆，得氧化铝基复合涂层；包括：基体预处理、配置激光熔覆粉体、预置粉末和激光熔覆工序；所述激光熔覆粉体按质量百分比计为：Al2O356-72％，TiO214-18％，WC10-30％，其中，Al2O3颗粒度为20-50μm；且所述激光熔覆功率为1000-2000W，所述氧化铝基复合涂层的厚度为0.3-0.6mm。A method for reducing cracks in laser cladding alumina-based composite coatings, wherein laser cladding powder is pre-placed on the surface of a substrate, and laser cladding is performed under an argon protective atmosphere to obtain alumina-based composite coatings; including : Substrate pretreatment, configuration of laser cladding powder, preset powder and laser cladding process; the laser cladding powder is calculated by mass percentage: Al 2 O 3 56-72%, TiO 2 14-18%, WC10-30%, wherein, the particle size of Al 2 O 3 is 20-50 μm; and the laser cladding power is 1000-2000W, and the thickness of the aluminum oxide-based composite coating is 0.3-0.6mm.
在一些优选的实施方式中，上述氧化铝基复合涂层的厚度为0.4-0.6mm；更优选的，所述氧化铝基复合涂层的厚度为0.5mm。In some preferred embodiments, the thickness of the alumina-based composite coating is 0.4-0.6 mm; more preferably, the thickness of the alumina-based composite coating is 0.5 mm.
进一步地，所述基体为Ti-6Al-4V(TC4)合金板。Further, the substrate is a Ti-6Al-4V (TC4) alloy plate.
进一步地，所述激光熔覆粉体通过球磨混粉方式；其中，球料比为10:1，球磨时间为3h，转速为300rpm。Further, the laser cladding powder is mixed by ball milling; wherein, the ball-to-material ratio is 10:1, the ball milling time is 3 hours, and the rotation speed is 300 rpm.
进一步地，所述预置粉末过程为：将球磨后的激光熔覆粉体与粘结剂按质量体积比为(9-14):3-7(g/mL)进行混合，搅拌均匀后均匀涂覆于所述基体表面，平整压实并真空烘干；所述涂覆层厚度为0.8-1mm。在一些优选的实施方式中，粘接剂为乙酸纤维素和二丙酮醇按质量体积比为1:25(g/mL)的混合物，且所述二丙酮醇为分析纯AR。Further, the pre-powder process is as follows: mix the ball-milled laser cladding powder and the binder at a mass volume ratio of (9-14): 3-7 (g/mL), and mix evenly Coating on the surface of the substrate, flattening and compacting and drying in vacuum; the thickness of the coating layer is 0.8-1mm. In some preferred embodiments, the binder is a mixture of cellulose acetate and diacetone alcohol at a mass volume ratio of 1:25 (g/mL), and the diacetone alcohol is analytically pure AR.
进一步地，所述激光熔覆工艺为：采用IPG-YLS-5000型光纤激光器，激光熔覆功率为1500-2000W，扫描速度为600mm/min，离焦量为60mm，所述氩气的输送速度为5L/min、纯度为99.99％。Further, the laser cladding process is as follows: using an IPG-YLS-5000 fiber laser, the laser cladding power is 1500-2000W, the scanning speed is 600mm/min, the defocus is 60mm, and the delivery speed of the argon is It is 5L/min and the purity is 99.99%.
与现有技术相比，本发明的有益效果在于：Compared with prior art, the beneficial effect of the present invention is:
一、利用颗粒度为纳米级的球磨混合粉体，通过加入适量WC，得到的氧化铝基复合涂层组织致密、均匀且无裂纹，与金属基材形成良好的冶金结合。1. By using ball-milled mixed powder with a particle size of nanometer scale and adding an appropriate amount of WC, the obtained alumina-based composite coating has a dense, uniform and crack-free structure, and forms a good metallurgical bond with the metal substrate.
二、与现有技术相比，本发明方法能有效提高涂层的硬度，并能有效减少涂层裂纹，整个过程易于实现自动化控制，效率高、无污染且成本低，具有较为理想的工程应用价值。2. Compared with the prior art, the method of the present invention can effectively improve the hardness of the coating, and can effectively reduce coating cracks. The whole process is easy to realize automatic control, high efficiency, no pollution and low cost, and has a relatively ideal engineering application value.
附图说明Description of drawings
图1为实施例6中激光熔覆氧化铝基复合涂层横截面的SEM照片。FIG. 1 is an SEM photo of the cross-section of the laser cladding alumina-based composite coating in Example 6.
具体实施方式Detailed ways
下面结合具体实施例进一步阐述本发明。The present invention is further described below in conjunction with specific examples.
对比例comparative example
在60(长)×60(宽)×10(厚)mm的Ti-6Al-4V(TC4)钛合金板表面采用激光熔覆方法制备氧化铝基复合涂层，具体步骤如下：Alumina-based composite coatings were prepared by laser cladding on the surface of a Ti-6Al-4V (TC4) titanium alloy plate of 60 (length) × 60 (width) × 10 (thickness) mm, and the specific steps were as follows:
1、钛合金板表面活化处理1. Surface activation treatment of titanium alloy plate
对厚度为10mm的钛合金板表面用100#粗砂纸进行打磨粗化处理或者采用喷砂机表面喷砂处理，去除表面氧化层及污渍，以增强钛合金表面与氧化铝基复合熔覆层的结合，然后用酒精和丙酮清洗，干燥箱中烘干。Use 100# coarse sandpaper to roughen the surface of the titanium alloy plate with a thickness of 10mm or use a sandblasting machine to remove the surface oxide layer and stains, so as to enhance the adhesion between the titanium alloy surface and the alumina-based composite cladding layer. Combine, then wash with alcohol and acetone, and dry in the oven.
2、配制激光熔覆粉体2. Preparation of laser cladding powder
按下述质量百分数配制激光熔覆粉体：80％Al2O3、20％TiO2，混合粉末在球磨机中球磨3小时。The laser cladding powder was prepared according to the following mass percentages: 80% Al 2 O 3 , 20% TiO 2 , and the mixed powder was milled in a ball mill for 3 hours.
3、预置粉末3. Preset powder
将上述混合粉末采用预置粉末法预置到基板上，预置粉末法的工艺如下：将混合粉末与粘接剂混合成膏状，混合搅拌均匀后，均匀涂覆在待熔覆工件的表面，进行压实和表面物理平整，预置层厚度为0.8-1mm，最后在真空干燥箱中烘干。The above-mentioned mixed powder is preset on the substrate by the preset powder method. The process of the preset powder method is as follows: mix the mixed powder and the adhesive into a paste, mix and stir evenly, and evenly coat the surface of the workpiece to be clad , for compaction and surface physical leveling, the thickness of the preset layer is 0.8-1mm, and finally dried in a vacuum drying oven.
4、激光熔覆制备氧化铝基复合涂层4. Preparation of alumina-based composite coatings by laser cladding
将处理好的钛合金放在激光器平台上，启动机器人控制激光熔覆，其中激光熔覆工艺参数为：光纤激光功率为1000W，扫描速率为600mm/min，离焦量为60mm，氩气输送速度为5L/min，得氧化铝基复合涂层。Put the processed titanium alloy on the laser platform, start the robot to control the laser cladding, and the laser cladding process parameters are: fiber laser power is 1000W, scan rate is 600mm/min, defocus is 60mm, argon gas delivery speed 5L/min to obtain an alumina-based composite coating.
经过测试，上述氧化铝基复合涂层宏观上有较多细小裂纹，涂层厚度为0.2-0.4mm，涂层组织粗大、有较多气孔和裂纹、平均硬度为684.5HV0.3，与钛合金基体的硬度380HV0.3相比较高。After testing, the above-mentioned alumina-based composite coating has many small cracks on the macroscopic scale, the coating thickness is 0.2-0.4mm, the coating structure is coarse, there are many pores and cracks, and the average hardness is 684.5HV 0.3 , which is compatible with the titanium alloy substrate. The hardness is higher than 380HV 0.3 .
实施例1Example 1
本实施例与对比例基本相同，所不同的是本实施例中激光熔覆粉体按质量百分比计为：Al2O372％，TiO218％，WC10％，其中Al2O3颗粒度为20-50μm。与对比例相比，实施例1中添加10％的WC，制备的氧化铝基复合涂层宏观上无明显裂纹，涂层组织均匀，出现细枝晶组织，气孔和裂纹明显减少，涂层平均硬度为1099.6HV0.3。This example is basically the same as the comparative example, the difference is that the laser cladding powder in this example is calculated by mass percentage: Al 2 O 3 72%, TiO 2 18%, WC 10%, where the particle size of Al 2 O 3 20-50μm. Compared with the comparative example, adding 10% WC in Example 1, the prepared alumina-based composite coating has no obvious cracks macroscopically, the coating structure is uniform, fine dendrite structure appears, pores and cracks are significantly reduced, and the coating average The hardness is 1099.6HV 0.3 .
实施例2Example 2
本实施例与实施例1基本相同，所不同的是本实施例中激光熔覆粉体按质量百分比计为：Al2O364％，TiO216％，WC20％，其中Al2O3颗粒度为30μm。与对比例相比，实施例2中添加20％的WC，制备的氧化铝基复合涂层宏观上成型较好，涂层组织细化，等轴晶状组织密度增加，无气孔，几乎消除了裂纹，涂层平均硬度为1132.8HV0.3，与基体相比，硬度提高了约2倍。This example is basically the same as Example 1, except that the laser cladding powder in this example is calculated by mass percentage: Al 2 O 3 64%, TiO 2 16%, WC 20%, in which Al 2 O 3 particles The degree is 30 μm. Compared with the comparative example, adding 20% WC in Example 2, the prepared alumina-based composite coating has better macroscopic molding, the coating structure is refined, the equiaxed crystal structure density is increased, and there is no porosity, almost eliminating Cracks, the average hardness of the coating is 1132.8HV 0.3 , compared with the substrate, the hardness is increased by about 2 times.
实施例3Example 3
本实施例与实施例1基本相同，所不同的是本实施例中激光熔覆粉体按质量百分比计为：Al2O356％，TiO214％，WC30％，其中Al2O3颗粒度为50μm。与对比例相比，实施例3中添加30％的WC，制备的氧化铝基复合涂层宏观上成型较好，涂层组织更加细化，但出现少许气孔，无明显裂纹，涂层平均硬度为1203.8HV0.3。This example is basically the same as Example 1, except that the laser cladding powder in this example is calculated by mass percentage: Al 2 O 3 56%, TiO 2 14%, WC 30%, in which Al 2 O 3 particles The degree is 50 μm. Compared with the comparative example, adding 30% WC in Example 3, the prepared alumina-based composite coating has a better macroscopic shape, and the coating structure is more refined, but there are a few pores, no obvious cracks, and the average hardness of the coating is 1203.8HV 0.3 .
实施例4Example 4
本实施例与对比例基本相同，所不同的是本实施例中激光功率为1500W，其他实验条件相同。与对比例相比，实施例4中激光功率为1500W，制备的氧化铝基复合涂层宏观上有较多细小的裂纹，涂层厚度为0.3-0.5mm，涂层组织细化，有少许气孔和裂纹，涂层平均硬度为818.1HV0.3，与基体相比，硬度提高约1倍。This embodiment is basically the same as the comparative example, except that the laser power in this embodiment is 1500W, and other experimental conditions are the same. Compared with the comparative example, the laser power in Example 4 is 1500W, and the prepared alumina-based composite coating has many fine cracks macroscopically, the coating thickness is 0.3-0.5mm, the coating structure is refined, and there are a few pores And cracks, the average hardness of the coating is 818.1HV 0.3 , compared with the substrate, the hardness is about 1 times higher.
实施例5Example 5
本实施例与实施例1基本相同，所不同的是本实施例中激光功率为1500W，其他实验条件相同。与对比例相比，实施例5中激光功率为1500W，制备的氧化铝基复合涂层宏观上裂纹明显减少，涂层出现细枝晶，组织较为细化，有少许气孔和少量裂纹，涂层平均硬度为1163.7HV0.3。This embodiment is basically the same as Embodiment 1, except that the laser power in this embodiment is 1500W, and other experimental conditions are the same. Compared with the comparative example, the laser power in Example 5 is 1500W, the macroscopic cracks of the prepared alumina-based composite coating are significantly reduced, fine dendrites appear in the coating, the structure is relatively refined, there are a few pores and a small amount of cracks, the coating The average hardness is 1163.7HV 0.3 .
实施例6Example 6
本实施例与实施例2基本相同，所不同的是本实施例中激光功率为1500W，其他实验条件相同。与对比例相比，实施例6中激光功率为1500W，制备的氧化铝基复合涂层宏观上无裂纹，涂层等轴晶状组织密度增加，组织细化，无气孔和裂纹，涂层平均硬度为1205.1HV0.3。This embodiment is basically the same as Embodiment 2, except that the laser power in this embodiment is 1500W, and other experimental conditions are the same. Compared with the comparative example, the laser power in Example 6 is 1500W, and the prepared alumina-based composite coating has no macroscopic cracks, the equiaxed crystal structure density of the coating increases, the structure is refined, no pores and cracks, and the coating average The hardness is 1205.1HV 0.3 .
实施例7Example 7
本实施例与实施例3基本相同，所不同的是本实施例中激光功率为1500W，其他实验条件相同。与对比例相比，实施例7中激光功率为1500W，制备的氧化铝基复合涂层宏观上无明显裂纹，涂层组织更加细化，消除了气孔和裂纹，涂层平均硬度为1277.9HV0.3。This embodiment is basically the same as Embodiment 3, except that the laser power in this embodiment is 1500W, and other experimental conditions are the same. Compared with the comparative example, the laser power in Example 7 is 1500W, the prepared alumina-based composite coating has no obvious cracks macroscopically, the coating structure is more refined, pores and cracks are eliminated, and the average hardness of the coating is 1277.9HV 0.3 .
实施例8Example 8
本实施例与对比例基本相同，所不同的是本实施例中激光功率为2000W，其他实验条件相同。与对比例相比，本实施例中激光功率为2000W，制备的氧化铝基复合涂层宏观上有少量细小的裂纹，涂层厚度为0.4-0.6mm，涂层中出现少量细枝晶，组织较为细化，有少许裂纹和气孔，涂层平均硬度为1048.1HV0.3。This embodiment is basically the same as the comparative example, except that the laser power in this embodiment is 2000W, and other experimental conditions are the same. Compared with the comparative example, the laser power in this example is 2000W, and the prepared alumina-based composite coating has a small amount of fine cracks macroscopically, the thickness of the coating is 0.4-0.6mm, a small amount of fine dendrites appear in the coating, and the structure It is relatively fine, with a few cracks and pores, and the average hardness of the coating is 1048.1HV 0.3 .
实施例9Example 9
本实施例与实施例1基本相同，所不同的是本实施例中激光功率为2000W，其他实验条件相同。与对比例相比，本实施例中激光功率为2000W，制备的氧化铝基复合涂层宏观上午明显裂纹，涂层细枝晶状组织密度增加，组织细化，有少许裂纹和气孔，涂层平均硬度为1213.5HV0.3，与基体相比，硬度提高了2倍多。This embodiment is basically the same as Embodiment 1, except that the laser power in this embodiment is 2000W, and other experimental conditions are the same. Compared with the comparative example, the laser power in this example is 2000W, and the prepared alumina-based composite coating has obvious cracks in the macroscopic morning, and the density of the fine dendritic structure of the coating increases, the structure is refined, and there are a few cracks and pores. The average hardness is 1213.5HV 0.3 , compared with the matrix, the hardness has increased by more than 2 times.
实施例10Example 10
本实施例与实施例2基本相同，所不同的是本实施例中激光功率为2000W，其他实验条件相同。与对比例相比，本实施例中激光功率为2000W，制备的氧化铝基复合涂层宏观上无裂纹，成型质量较好，涂层等轴晶状组织密度增加，组织细化，消除了裂纹，涂层平均硬度为1298.5HV0.3，与基体相比，硬度提高了2倍多。This embodiment is basically the same as Embodiment 2, except that the laser power in this embodiment is 2000W, and other experimental conditions are the same. Compared with the comparative example, the laser power in this example is 2000W, and the prepared alumina-based composite coating has no macroscopic cracks, and the forming quality is better. The equiaxed crystal structure density of the coating is increased, the structure is refined, and the cracks are eliminated. , the average hardness of the coating is 1298.5HV 0.3 , compared with the substrate, the hardness has increased by more than 2 times.
实施例11Example 11
本实施例与实施例3基本相同，所不同的是本实施例中激光功率为2000W，其他实验条件相同。与对比例相比，本实施例中激光功率为2000W，制备的氧化铝基复合涂层宏观上无裂纹，涂层组织更加细化，消除了裂纹，涂层平均硬度为1344.0HV0.3，与基体相比，硬度提高了2倍多。This embodiment is basically the same as Embodiment 3, except that the laser power in this embodiment is 2000W, and other experimental conditions are the same. Compared with the comparative example, the laser power in this example is 2000W, and the prepared alumina-based composite coating has no macroscopic cracks, the coating structure is more refined, and the cracks are eliminated. The average hardness of the coating is 1344.0HV 0.3 , and Compared with that, the hardness has increased by more than 2 times.
以上所述的实施例对本发明的技术方案和有益效果进行了详细说明，应理解的是以上所述仅为本发明的具体实施例，并不用于限制本发明，凡在本发明的原则范围内所做的任何修改和改进等，均应包含在本发明的保护范围之内。The embodiments described above have described the technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. All within the scope of the principles of the present invention Any modifications and improvements made should be included within the protection scope of the present invention.
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